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在空气、食物和水中广泛存在的多环芳烃(PAH),其中有些是强致癌物(如苯并[a]芘);有些则不致癌或毒性较弱。而这些化合物通常是同时存在的,因此,如何从复杂的混合物中分离和鉴别其微量的单个化合物越来越受到人们的关注。本文针对以上问题提出分离和鉴定17种PAH的方法。萃取时可随样品的性质采取不同的方法,但最终萃取物都用高效液相色谱法(HPLC)进行测定。以6种标准PAH加入食物和水作了回收试验,其回收一般在75～100%范围,苯并[a]芘的检测极限:食物0.02μg/kg,水0.3 ng/kg,烟150 pg/滤器。具体方法和结果摘要如下。
Polycyclic aromatic hydrocarbons (PAHs), which are widespread in air, food and water, some of which are carcinogenic (such as benzo [a] pyrene); others are not carcinogenic or are less toxic. However, these compounds are usually co-existing. Therefore, how to separate and identify a trace amount of a single compound from a complex mixture has drawn more and more attention. In this paper, we propose a method for the isolation and identification of 17 PAHs. Different methods can be used depending on the nature of the sample during extraction, but the final extract is determined by high performance liquid chromatography (HPLC). Recoveries of food and water were made with 6 standard PAHs and the recovery was generally in the range of 75-100%. The detection limit of benzo [a] pyrene was 0.02 μg / kg for food, 0.3 ng / kg for water and 150 pg / filter. The specific methods and results are summarized as follows.